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11dd078f64
Replaces the plugin-only set_slices/set_fill_surfaces/set_lslices mutators with a faithful, mutable binding of the core geometry types, so a plugin edits the slicing graph through the same object model the C++ code uses. - Point, Polygon, ExPolygon, Surface and SurfaceCollection gain constructors, writable accessors (contour/holes, set/append/clear, filter_by_type), transforms (rotate/scale/translate), boolean ops and offset. Polygon exposes a zero-copy writable numpy view via a make_writable_rows helper. - LayerRegion.slices/fill_surfaces stay read-only refs but are now live, in-place-editable SurfaceCollections; Layer.make_slices() re-derives the islands and refreshes lslice bounding boxes. - Rewrites the Inset and Twistify samples on the new API (in-place ExPolygon transforms, ExPolygon.offset, SurfaceCollection.set), dropping their numpy dependency; each touched layer calls make_slices() so downstream steps see the edited footprint. Adds tests covering in-place edits through a live collection. BREAKING CHANGE: set_slices/set_fill_surfaces/set_lslices and the internal parse_expolygon(_list)/surfaces_from_py helpers are removed. Plugins mutate through the class API (SurfaceCollection.set/append/clear, Polygon.set_points/append, ExPolygon.set_holes) instead.